如何用ASP AJAX做类似google的搜索提示

Index.html 实现功能,一个文本框,输入内容并实现提示

search.asp 查询功能,让文本框输入的内容在数据库中查询,然后返回给客户端

conn.asp 数据库连接功能,实现与数据库相连 xmlhttp.js AJAX 核心部分,用来把客户端的数据传给服务端,再把服务端的数据返还给客户端.

style.css 样式文件,主要是对google提示框查询到的内容进行样式化处理

先看第一个文件style.css
 
以下为引用的内容：
[code=css]
@charset "utf-8";
/* CSS Document */

body
{
font-size:12px;
font-family:Arial, Helvetica, sans-serif;
}

#search_suggest
{
position:absolute;
background:#FFFFFF;
text-align:left;
border:1px #000000 solid;
}

.suggest_link_over
{
background-color:#e8f2fe;
padding:2px 6px;
}

.suggest_link
{
padding:2px 6px;
background-color:#FFFFFF;
}

.none
{
display:none;
}

第二个文件: xmlhttp.js

以下为引用的内容：
// JavaScript Documentrt
var xmlHttp = createXmlHttpRequest();

function createXmlHttpRequest()
{
var xmlhttp = null;
try
{
xmlhttp = XMLHttpRequest();
}
catch(e1)
{
try
{
xmlhttp = new ActiveXObject("MSXML2.XMLHTTP");
}
catch(e2)
{
try
{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
catch(e3)
{
xmlhttp = false;
alert("创建失败!");
}
}
}

return xmlhttp;
}

function change_key()
{
if (xmlHttp.readyState == 4 || xmlHttp.readyState == 0)
{
var str = document.getElementById("txt_key").value;

xmlHttp.open("get","search.asp?key=" str ,true);
xmlHttp.onreadystatechange = handSearchRequest;
xmlHttp.send(null);
}
}

function handSearchRequest()
{
if (xmlHttp.readyState == 4)
{
var div = document.getElementById("search_suggest");
div.innerHTML = "";
var str = xmlHttp.responseText.split("|");

for (var i=0; i<str.length; i )
{
var suggest = ’<div onmouseover="javascript：suggestOver(this);" ’;
suggest = ’onmouseout="javascript：suggestOut(this);" ’;
suggest = ’onclick="javascript：setSearch(this.innerHTML);" ’;
suggest = ’class="suggest_link">’ str[i] ’</div>’;
div.innerHTML = suggest;
}
}
}

function setSearch(div_value)
{
document.getElementById("txt_key").value = div_value;
document.getElementById("search_suggest").className = ’none’;
}
function suggestOver(div_value)
{
div_value.className = ’suggest_link_over’;
}

function suggestOut(div_value)
{
div_value.className = ’suggest_link’;
}

第三个文件:conn.asp

以下为引用的内容：
<%
set conn = Server.CreateObject("Adodb.Connection")
connStr = "Provider=SQLOLEDB;Server=./SQLEXPRESS;UID=sa;PWD=sa;Initial catalog=test;"
conn.ConnectionString = connStr
conn.open
%>

第四个文件:search.asp

以下为引用的内容：
<%@LANGUAGE="VBSCRIPT" CODEPAGE="65001"%>
<!– #include file="conn.asp" –>
<%
key = request.QueryString("key")

if (key <> "") then
key = replace(key,"/","")
key = replace(key,"’","")
key = replace(key,"or","")
sel_sql = "select [key] from [key] where [key] like ’" & key & "%’"
dim keyword
keyword = ""

set rs = conn.execute (sel_sql)
do while not rs.eof
keyword = keyword & rs(0) & "|"
rs.movenext
loop

response.Write(keyword)
end if
%>